Question: What city is twinned with Sofia?
Paraphrase: What city is twinned with Sofia?
SPARQL (Wikidata):  select distinct ?obj where { wd:Q472 wdt:P190 ?obj . ?obj wdt:P31 wd:Q515 } 
Answer: Sidon, Salalah, Warsaw, Skopje, Milan, Tbilisi, Athens, Helsinki, Bratislava, Madrid, Algiers, Amman, Tirana, London, Brussels, Tel Aviv, Bursa